Grinding machine



23 1923. Oct F. c. WEAVER GRINDING MACHINE 3 Sheets-Sheet 1 Filed May 2, 1922 Oct; 23 1923.

c. WEAVER GRINDING MACHINE Filed May 2, 1922 3 Sheets-Sheet 2 Oct. 23 1923.

F. C WEAVER GRINDING MACHINE Filed May 2, 1922 3 Sheets-Sheet 5 Patented Oct. 23, 1923. l

FLOYD CALVIN WEAVER, on wAsHrNGroN, nis'rnro'r OEGOLUIVIBIA.

GRINDING MACHINE.

Application fiIed'MayQ, 1922. Serial l To. 55 7,9 3s.

To all whom't't may concern: Be it known that I, F oYD C. WEAVER, a citizen of the United States, residing at Washington, District of Columbia, have in-;

vented certain new and useful Improvements in Grinding Machines, of which the following is a specification, reference being had therein to the accompanying drawings- The object of this invention is to provide a driving mechanism for moving alapping plate relative to a work carrying plate in a desired orbit and for varying the orbit and the-position of the orbit in respectto the work carrying plate so that the grinding maybe performed in a desired manner.

With these and other objects in view,'1 ny invention comprises certain novel combinations, constructions and arrangements of parts as will be hereinafter described, illustrated in the accompanying drawings, and more particularly pointed out in the ap pended claims. i

In the drawings:

Figure 1 isa' plan view of the lapping machine showing. the relative-relation and disposition of the lapping plate, the work carrying plate, the eccentric driving arms and then accessoriesfor'driving the lapping plate over the work carrying plate. Figure 2 is a vertical cross section of the machine shown in'Fig. 1, sectioned along .the line 2-2 in the direction indicated by the arrows. This shows the relative dispositions of the lapping plate and work carrying plate relative to the driving mechanism; igure 3 is a vertical section of the machineshownin Fig. 1, sectioned along the line 3- 3 in the direction indicated by the arrows. This shows thearrangement of the driving eccentricsfor theoperation' of the lapping plate over the work carrying plate.

Figure 4 is a vertical" section of the machine shown in. Fig. 1, sectioned along the line L-{in the direction indicated by the arrows, showing'the main driving shaft and driving pulley. i I

F gure 5 is a vertical section of the machine shown in. Fig. 1, sectioned at the line 55-in thedirection indicated by the arrows.

This shows the arrangement of the operating parts which accomplish the shifting ofthe path of the'lapp'ing plate, relative to the work carrying plate, and "which arrange? ment permits any desired changeof the positio'n ofthe path to'be made during thefoperation of the machine in lapping etcf'; j

InFigure 1, the lappingfplate2 is driven over the work carrying plate 1,-in a desired and prescribed manner by thepin 3 which is carried in an adjustable clampingholder 51 secured tothe bar 25 which is in turn secured tothe hinge fork-24, hinging upon the bearing collar 23 onthe driving pin 22. The bar 25 carries the adjustable blocks 47 and 46 with 'thetightening screws 18, forming the ball socket bearing forithe. bar 45. This bar is secured by screws 52 to thebar 43 which in its turn is secured to hinge fork 4:2 hinging upon the bearing collar 41 on the driving pin 40. This pin 3 is drivenffrom the two driving pins22 and 40, and has a free movement vertically to be lifted out of the lapping plate 2 when desired. The ball and socket joint of bar45 in block 47 may be adjusted over a limited amount as desired along the'bar 25 andclampedin posi tion by screws 48'bearing upon piece 46 thus clamping the edges of the tube .25 between 46 ant 147. A

Driving pin 40 is adjustably secured in a slot of the arm 53 securely fastened to the vertical. spindle 44. Below the arm 53 the arm 39 issecurely fastenedto the spindle 4st. This arm 39 isin turn connected to the rod 37 by pin 38, making a hinge joint. This rod 87' is inturn connected't'o'the driving eccentric or'slotted plate 16 .by the pin 35.

slot 62 of arm 21 which is firmly secured to v and oscillates about the axis spindle 20. The arm 19 is also firmly securedto the spindle 20, thus'o'scillation of arm' 19 imparts oscillation to the arm 21 and the desired movement to thepin 22. Arm l9 is connected by pin 49 to the eccentric rod 18 which also forms the eccentric strap forthe main driving eccentric 17 The eccentric l7 and the ec'centri'c'plate 16 are each securely attached to the vertical spindle 55, as shown in Fig.3..

Spindle 55 carries the firmlyisecured drivinggearfl5 engaged bythezworm or gear pinion 131- rigidly mounted uponfth'e driving shaft] 1Q, in turn is connected by the handle "12 of the clutch '11 to the driving pulley 18. Thus the power for the movement of the pin 3 for lapping plate 2 1s delivered from the main driving pulley 13, through the clutch 11 to shaft 10 and from the shaft 10 to spindle 55, Which carries the two eccentrics 17 and 16, etc.

Referring to Fig. 2 in addition to Figs. 1 and 3, the work carrying plate l is securely fastened to the vertical spindle 56, to which is secured the driving gear 4: in mesh with the worm pinion or gear pinion 5 securedon shaft 50 which carries 'at the outer end the hand wheel 3% and at the other end the clutch 6 operated by lever or control 7. Thus the separate section of shaft 50 carrying gear8 driven by gear 9 secured on main driving shaft 10, may be connected or disconnected at the will of theoperator. In this manner work carrying plate 1 may be rotatedby the hand wheel 84 at the will of the operator, or left to drive automatically while ping operates the lapping plate 2.

Referring to Figs. 421ml 5, in connection 5 with Fig. l, the axis spindle 20 has a working bearin in arm 26 which is'securely fastened to vertical axis 57. Arm 26 carries also the yoke holding the screw thread hearing 28 by swivel screws 27 for the screw shaft '29. ihis screw shaft 29 has at its end near work carrying plate 1, a hand wheel 33 and a swivel bearingBl on swivel centers 32, also a thrust collar 30. Thus with the arm 21 securely fastened to the axis-20 as well as the arm l9, and with axis 20 free to oscillate in its bearing in arm 26; the arm 26 can be slowly oscillated about axis 57 by the handwhee'l 33 at the will ofthe operator at all stages of the machine operation. Thus also by operating hand wheel '33, axis 20 may be oscillated "about axis 57 through any desired angle without interfering with the strokes of the pin 22, having only the effect of shifting the position of the orbit of the pin 3 and of lapping plate 2 over the work carrying plate 1. Also by shifting the position of the .pathof strokes of tool pin 3 and lapping plate 2 by operating'the handwheel 34, a completely controlled localization of lapping effortmay be brought to any desired part of work carrying plate 1.

.l/Vhile I have described the preferred en bodiment of my invention, and have illustrated the same in the accompanying drawings, certain minor changes or alterations may appear to one skilledin the art to which this invention relates, during the extensive manufacture of the same and I, therefore, reserve the .right'tomake such alterations or changes as shall fairly fall within the scope of the appended claims.

The invention having been described. whatisclaimed is: I I

1. In a grinding and lapping machine iaviaeo of a work carrying plate, a lapping plate I l a bell crank structure having an arm connected with the end of said bar, a pitman rotatably'carried by one eccentric and connected with another arm of the bell crank structure whereby longitudinal movement will be imparted to said bar, and means for imparting transverse movement to the bar including a pitman having connection with the other eccentric for rotary movement thereon during rotation of the eccentric.

2. In .a grinding and lapping machine of the character described, the combination of a work carrying'plate, a lapping plate positioned above said work carrying plate, a pin engagingsaid lapping plate, a bar connected to said pin, a driven spindle, a pair of eccentrics keyed upon said spindle and extending in opposite directions, means adjustably connecting one of said eccentrics to one end of said bar and including a collar portion rotatably fitting about the periphery of the eccentric, and

means adjustably connected with the re' maining eccentric for movement radially thereof and serving to adjustably connect the last mentioned eccentric to said bar intermediate the ends thereof, whereby the bar will be driven so that the lapping-plate will be moved ina variable manner, as ant for the purposes set forth.

3. In a grinding and lapping machine of the character described, the combination of a work carrying plate, a lapping plate positioned above said work carrying plate, a pin engaging said lapping plate, a bar connected to said pin, a drivenspindle, a pair of eccentrics keyed upon said spindle, one of said eccentrics having a driving slot, a rod having means on one end adjustably mounted in said slot, and means ;on the remaining end of said rod adjustably connecting said rod to said bar intermediate the ends of the bar, and means having a portion rotatably mounted-about the periphcry of the other eccentric, said means serving to connect the last mentionedv eccentric to the end of the bar, whereby the bar may be driven so as to move the lapping plate in a variable manner, as and forthe pur poses set forth. 7

4. In a grinding and lapping machine of the character described, the combination of a work carrying plate, a lapping plate positioned above said work carrying plate, a pin engaging said lapping plate, a bar connected to saidpin, a 'driven spindle, a pair. of eccentrics keyed upon said spindle. a rod adjustably connected to one of said .eccentrics, a vertical axis spindle, an arm of the character described, the comblnatlon pivotally mounted upon said axis spindle and pivotally connected to said rod, a slotted arm mounted upon said first-mentioned arm, a second bar connected to the first-mentioned bar, means adjustably connecting the second-mentioned bar to said slotted arm, and means connecting the remaining eccentric to the end of the first-mentioned bar, as and for the purposes set forth.

5. In a grinding and lapping machine of the character described, the combination of a work carrying plate, a lapping plate positioned above said work carrying plate,

I in an adjusted a pin engaging said lapping plate, a bar connected to said pin, a driven splndle, a

' pair of eccentrics keyed upon said spindle,

said bar being of a tube-like construction and being slotted, blocks movably mounted within and without said bar, set screws engaging said blocks' for holding the same set position, a second bar connected to said blocks, thereby being adjustably connected to the first-mentioned bar, means connected to one of said eccentrics and to said second-mentioned bar for driving the same, and means connecting the remaining eccentric to the end of the first-mentioned bar, whereby the first-mentioned bar will be driven so as to move the for the purposes set forth.

6. In a grinding and lapping machine of the character described, the combination of a work carrying plate, a lapping plate positioned above said work carryingiplate,

a pin engaging said lapping plate, a bar connected to said pin, a driven spmdle, a

pair of eccentrics keyed upon said spindle, means adjustably connecting one of said eccentrics to sa-id'bar intermediate the ends of the bar,,a frame-like rod connected to the remaining eccentric, a fixed vertical axis, an arm pivotallymounted upon saidaxis, a screw shaft adjustably connected to the arm at one end thereof for adjusting said arm, an axis spindle carried by said arm intermediate its ends, a second arm connected to said frame-like rod and to said axis spindle, and means adjustably connecting said axis spindle to the end of r said bar, whereby the bar will be driven so as to impart variable strokes to said lapping plate, as and for the purposes set forth, I 1 Y In testimony whereof I hereunto afiix my signature.

FLOYD CALVIN WEAVER. 

